Lecture16-PhotoMultiDiodePSPICEAnalysis

Lecture16-PhotoMultiDiodePSPICEAnalysis - ECE 3040 - Dr....

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Unformatted text preview: ECE 3040 - Dr. Alan Doolittle Georgia Tech Lecture 16 P-N Junction Diodes: Part 6 Photodiodes, Solar Cells (Photovoltaic devices), and Multiple Diode Analysis Reading: Pierret 9.2 and Notes ECE 3040 - Dr. Alan Doolittle Georgia Tech Photodiode Reversed Bias Diode with no light illumination Reversed Bias Diode WITH light illumination results in extra drift current due to photogenerated ehps that can reach the junction. ECE 3040 - Dr. Alan Doolittle Georgia Tech ( ) ( ) L P N o V V o total Light to Due V V o total Light to Due dark total G L W L qA I e I I I e I I I I I T D T D + + + = + = + = 1 No-Light Light Light No-Light Bias Point I V Photodiode Every EHP created within the depletion region (W) and within a diffusion length away from the depletion region is collected (sweeped across the junction by the electric field) as photcurrent (current resulting from light). All other EHPs recombine before they can be collected. ECE 3040 - Dr. Alan Doolittle Georgia Tech Solar Cell = Unbiased Photodiode Light No-Light I V Since n p >n o and p n >p o at the junction edges, the voltage must be positive due to the law of the junction. = = = 2 ) ( ) ( ln i n n p p A n x x p x x n q kT V Current is negative or out of the p-type side (anode) Anode Cathode +- | I | V +- V Solar Cell acts as a battery producing power | I | ECE 3040 - Dr. Alan Doolittle Georgia Tech Multiple Diode Analysis Consider the 2- diode circuit below: On On Off On On Off Off Off D2 D1 Possible states for the 2 diodes: +15V-10V D1 D2 10 K 5 K I A I D2 I D1 Solution: Make a guess as to one of the possible states of the circuit....
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Lecture16-PhotoMultiDiodePSPICEAnalysis - ECE 3040 - Dr....

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